8GB kit not working in my MBP 2011 13". Any idea why?

Discussion in 'MacBook Pro' started by Philflow, Sep 21, 2011.

  1. Philflow macrumors 65816

    May 7, 2008
    I bought this memory for cheap:
    GeIL GS38GB1066C7DC
    PC3-8500 (DDR3-1066)
    CAS Latency 7

    I was assuming it would work in my MBP 2011 13" but it doesn't. When I boot there are some frequent short beeps played. Nothing else happens.

    Any ideas?

    I put the standard memory back and that works fine.
  2. Pentad macrumors 6502a


    Nov 26, 2003

    Maybe it is just defective? It happens. Have you tried one stick at a time? That might help you determine if one stick is bad or if both of them are bad.

  3. Philflow thread starter macrumors 65816

    May 7, 2008
    OK good idea. Will try one stick at a time now.
  4. jlc1978 macrumors 68020


    Aug 14, 2009
    You may have the wrong type of memory - the MB P uses PC3-10600 DDR3 1333 MHz - the PC3-8500 may be too slow to work in the 2011 MBP. I'm not sure you can put a slower speed memory without having issues.
  5. Philflow thread starter macrumors 65816

    May 7, 2008
    One stick seems to be defective. The other one works fine.

    I guess I'll have to return it.

    Can anyone confirm this?
  6. jlc1978 macrumors 68020


    Aug 14, 2009
    My numbers came from Apple's support site - http://support.apple.com/kb/ht1270

    It could be just defective or it may be that the Mac is sensitive to memory speed / timing issues and one works while one doesn't - even though it's not "defective." I've used faster, but not slower, memory in my Macs so I really don't have any anecdotal experiences, other than Macs can be real sensitive to memory issues.

    It would be interesting to see if slower memory works fine and if there is any speed hit.
  7. hekokimushi macrumors regular


    Oct 27, 2008
  8. macfan74318 macrumors member

    Aug 9, 2011

    I have one stick of 1066 (4 gb) and on 1333 (2 gb) and it automatically down clocked it to 1066

  9. Naimfan Suspended


    Jan 15, 2003
    Either bad RAM sticks or your 2011 doesn't like 1066 MHz - the 2011 models use 1333 MHz, so return the RAM and order the correct speed.

    If you look in the manual that came with your MBP, it gives the correct RAM spec as 1333 MHz. While 1066 MHz RAM MAY work, it's not what is specified.
  10. jdecraene85 macrumors newbie

    Sep 7, 2011
    I think the above people are right that you shouldn't use slower memory than 1333 Mhz on an 2011 MBP.
    I'd also get another kit with 1333 Mhz, if you take cas9 instead the price will be the same.
  11. iMacDragon macrumors 68000


    Oct 18, 2008
    Slower ram should work, but ideally you want the full spec 1333mhz.
  12. bigeasy_uk macrumors 6502

    Sep 8, 2005
    Leamington Spa, England
    It might technically 'work' but it might also slow the whole bus speed. It's been a while since I've tinkered and might be a different case now, but in my overclocking days if you upped the fsb it would affect the cpu and ram, so reducing the fsb might also slow the cpu.

    So while you get more ram using what you have, you might not get the benefit of it as everything else is running slower. I'd return it and get the correct spec'd memory.
  13. Philflow thread starter macrumors 65816

    May 7, 2008
    Update: RAM has been sent back to seller. I'll stick with 4GB for now.
  14. jlc1978 macrumors 68020


    Aug 14, 2009
    What model MBP? On my 2010 MBP, my 1333 8g is down clocked to 1066.
  15. Icy1007 macrumors 65816


    Feb 26, 2011
    Cleveland, OH
  16. Mojo1 macrumors 65816

    Jul 26, 2011
    In the future consider buying RAM from a reputable source. There are examples of bad RAM from any retailer, but in my experience the lowest-priced RAM sources have more problems.

    For example, I was recently enticed by RAM prices at Newegg.com. I have purchased a number of items from Newegg without a problem, but I haven't bought RAM.

    I perused the customer reviews for the RAM modules that are compatible with my new 13" MBP and I was struck by the number of reviews that stated that the RAM was DOA or incompatible for some reason...

    The last time that I purchased RAM from a company with some of the lowest prices listed on RAM Websites (1-800-4MEMORY) both the initial RAM and its replacement were defective. That was the last time that I did business with that company...

    In the end I purchased RAM from my old standby source, Other World Computing. When I order from OWC I know that the RAM is compatible with my Mac and that the company will quickly replace bad RAM (which has never happened to me).

    OWC is not the cheapest source, but it is certainly competitively-priced when comparing RAM from other reputable companies. I may have gotten the RAM cheaper from Newegg and probably would not have had a problem, but my time is valuable to me and the difference in cost isn't worth the hassle of disassembling my MBP multiple times, returning the RAM and waiting for delivery of the replacement modules.

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